Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Lease income	$ 276,730	$ 222,552	$ 543,087	$ 497,089
Other property income	3,074	2,435	5,027	4,740
Management, transaction, and other fees	7,355	6,126	13,748	12,942
Total revenues	287,159	231,113	561,862	514,771
Operating expenses:
Depreciation and amortization	74,217	85,058	151,476	174,353
Operating and maintenance	46,566	40,032	92,148	82,401
General and administrative	19,187	21,202	40,474	34,907
Real estate taxes	35,447	36,793	71,613	72,680
Other operating expenses	1,177	2,480	1,875	3,817
Total operating expenses	176,594	185,565	357,586	368,158
Other expense (income):
Interest expense, net	35,812	40,375	72,748	77,811
Goodwill impairment				132,128
Provision for impairment of real estate	135	230	135	1,014
Gain on sale of real estate, net of tax	(19,781)	(7,448)	(31,479)	(45,453)
Net investment (income) loss	(1,998)	(4,359)	(3,484)	564
Total other expense (income)	14,168	28,798	37,920	166,064
Income (loss) from operations before equity in income of investments in real estate partnerships	96,397	16,750	166,356	(19,451)
Equity in income of investments in real estate partnerships	435	2,824	12,101	14,242
Net income (loss)	96,832	19,574	178,457	(5,209)
Noncontrolling interests:
Exchangeable operating partnership units	(432)	(87)	(796)	28
Limited partners’ interests in consolidated partnerships	(910)	(441)	(1,515)	(1,105)
Income attributable to noncontrolling interests	(1,342)	(528)	(2,311)	(1,077)
Net income (loss) attributable to common stockholders	$ 95,490	$ 19,046	$ 176,146	$ (6,286)
Income (loss) per common share - basic	$ 0.56	$ 0.11	$ 1.04	$ (0.04)
Income (loss) per common share - diluted	$ 0.56	$ 0.11	$ 1.04	$ (0.04)
Partnership Interest [Member]
Revenues:
Lease income	$ 276,730	$ 222,552	$ 543,087	$ 497,089
Other property income	3,074	2,435	5,027	4,740
Management, transaction, and other fees	7,355	6,126	13,748	12,942
Total revenues	287,159	231,113	561,862	514,771
Operating expenses:
Depreciation and amortization	74,217	85,058	151,476	174,353
Operating and maintenance	46,566	40,032	92,148	82,401
General and administrative	19,187	21,202	40,474	34,907
Real estate taxes	35,447	36,793	71,613	72,680
Other operating expenses	1,177	2,480	1,875	3,817
Total operating expenses	176,594	185,565	357,586	368,158
Other expense (income):
Interest expense, net	35,812	40,375	72,748	77,811
Goodwill impairment				132,128
Provision for impairment of real estate	135	230	135	1,014
Gain on sale of real estate, net of tax	(19,781)	(7,448)	(31,479)	(45,453)
Net investment (income) loss	(1,998)	(4,359)	(3,484)	564
Total other expense (income)	14,168	28,798	37,920	166,064
Income (loss) from operations before equity in income of investments in real estate partnerships	96,397	16,750	166,356	(19,451)
Equity in income of investments in real estate partnerships	435	2,824	12,101	14,242
Net income (loss)	96,832	19,574	178,457	(5,209)
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(910)	(441)	(1,515)	(1,105)
Income attributable to noncontrolling interests	(910)	(441)	(1,515)	(1,105)
Net income (loss) attributable to common unit holders	$ 95,922	$ 19,133	$ 176,942	$ (6,314)
Income (loss) per common share - basic	$ 0.56	$ 0.11	$ 1.04	$ (0.04)
Income (loss) per common share - diluted	$ 0.56	$ 0.11	$ 1.04	$ (0.04)